Abstract: The construction of new power system with new energy as the main body has put forward higher requirements for the stability and reliability of high frequency power electronic equipment. Planar transformers, due to their high frequency and high power density characteristics, have been widely studied and applied as new type of devices for power transmission and conversion. Elaborate on the theory of impedance matching, construct an equivalent circuit model for high frequency transformer, and point out the importance of impedance matching for planar transformers under high-frequency conditions. Produce two high frequency planar transformer prototypes and compare the correlation between impedance and frequency under different winding methods, providing reference for the industrial design of planar transformers.